J/ApJ/792/45 SPT-SZ survey galaxy clusters optical spectroscopy (Ruel+, 2014)
Optical spectroscopy and velocity dispersions of galaxy clusters from
the SPT-SZ survey.
Ruel J., Bazin G., Bayliss M., Brodwin M., Foley R.J., Stalder B.,
Aird K.A., Armstrong R., Ashby M.L.N., Bautz M., Benson B.A., Bleem L.E.,
Bocquet S., Carlstrom J.E., Chang C.L., Chapman S.C., Cho H.M.,
Clocchiatti A., Crawford T.M., Crites A.T., De Haan T., Desai S.,
Dobbs M.A., Dudley J.P., Forman W.R., George E.M., Gladders M.D.,
Gonzalez A.H., Halverson N.W., Harrington N.L., High F.W., Holder G.P.,
Holzapfel W.L., Hrubes J.D., Jones C., Joy M., Keisler R., Knox L.,
Lee A.T., Leitch E.M., Liu J., Lueker M., Luong-Van D., Mantz A.,
Marrone D.P., McDonald M., McMahon J.J., Mehl J., Meyer S.S., Mocanu L.,
Mohr J.J., Montroy T.E., Murray S.S., Natoli T., Nurgaliev D., Padin S.,
Plagge T., Pryke C., Reichardt C.L., Rest A., Ruhl J.E., Saliwanchik B.R.,
Saro A., Sayre J.T., Schaffer K.K., Shaw L., Shirokoff E., Song J.,
Suhada R., Spieler H.G., Stanford S.A., Staniszewski Z., Starsk A.A.,
Story K., Stubbs C.W., van Engelen A., Vanderlinde K., Vieira J.D.,
Vikhlinin A., Williamson R., Zahn O., Zenteno A.
<Astrophys. J., 792, 45 (2014)>
=2014ApJ...792...45R 2014ApJ...792...45R (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Spectroscopy ; Redshifts ; Surveys
Keywords: catalogs - galaxies: clusters: general
Abstract:
We present optical spectroscopy of galaxies in clusters detected
through the Sunyaev-Zel'dovich (SZ) effect with the South Pole
Telescope (SPT). We report our own measurements of 61 spectroscopic
cluster redshifts, and 48 velocity dispersions each calculated with
more than 15 member galaxies. This catalog also includes 19
dispersions of SPT-observed clusters previously reported in the
literature. The majority of the clusters in this paper are
SPT-discovered; of these, most have been previously reported in other
SPT cluster catalogs, and five are reported here as SPT discoveries
for the first time. By performing a resampling analysis of galaxy
velocities, we find that unbiased velocity dispersions can be obtained
from a relatively small number of member galaxies (≲ 30), but with
increased systematic scatter. We use this analysis to determine
statistical confidence intervals that include the effect of membership
selection. We fit scaling relations between the observed cluster
velocity dispersions and mass estimates from SZ and X-ray observables.
In both cases, the results are consistent with the scaling relation
between velocity dispersion and mass expected from dark-matter
simulations. We measure a ∼30% log-normal scatter in dispersion at
fixed mass, and a ∼10% offset in the normalization of the
dispersion-mass relation when compared to the expectation from
simulations, which is within the expected level of systematic
uncertainty.
Description:
Most of the galaxy clusters for which we report spectroscopic
observations were published as SPT cluster detections (and new
discoveries) in Vanderlinde et al. (2010ApJ...722.1180V 2010ApJ...722.1180V), Williamson
et al. (2011ApJ...738..139W 2011ApJ...738..139W), and Reichardt et al. (2013, J/ApJ/763/127);
we refer the reader to those publications for details of the SPT
observations. The spectroscopic observations presented in this work
are the first of our ongoing follow-up program. The data were taken
from 2008 to 2012 using the Gemini Multi Object Spectrograph (GMOS;
Hook et al. 2004PASP..116..425H 2004PASP..116..425H) on Gemini South, the Focal Reducer
and low dispersion Spectrograph (FORS2; Appenzeller et al.
1998Msngr..94....1A 1998Msngr..94....1A) on VLT Antu, the Inamori Magellan Areal Camera
and Spectrograph (IMACS; Dressler et al. 2006SPIE.6269E..0FD) on
Magellan Baade, and the Low Dispersion Survey Spectrograph (LDSS339;
Allington-Smith et al. 1994PASP..106..983A 1994PASP..106..983A) on Magellan Clay.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 64 75 SPT Properties and Source of Spectroscopic Data
table3.dat 84 2070 Galaxy redshifts
table4.dat 64 61 Cluster Redshifts and Velocity Dispersions
--------------------------------------------------------------------------------
See also:
J/A+AS/129/399 : The ENACS Catalogue. V. (Katgert+ 1998)
J/ApJ/742/48 : Blanco survey of the lens BCS J2352-5452 (Buckley-Geer+, 2011)
J/ApJ/763/127 : Galaxy clusters discovered in the SPT survey
(Reichardt+, 2013)
J/ApJ/772/25 : Massive SZE clusters observations with ACT (Sifon+, 2013)
J/ApJ/774/23 : Chandra observations of SPT-SZ clusters (McDonald+, 2013)
J/ApJS/216/27 : Galaxy clusters discovered in the SPT-SZ survey (Bleem+, 2015)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 A6 --- --- [SPT-CL]
8- 17 A10 --- SPT-CL SPT identifier of associated cluster (G1)
18- 19 A2 --- n_SPT-CL [* **] Note on SPT-CL (2)
21- 28 F8.4 deg RAdeg Right Ascension in decimal degrees (J2000)
30- 37 F8.4 deg DEdeg Declination in decimal degrees (J2000)
39- 43 F5.3 --- z Redshift
45- 49 F5.2 --- Signi ? SPT detection significance
51- 55 F5.2 10+14Msun M500cSPT ? SPT cluster mass estimate
(in 10+14Msun/h70) (3)
57- 60 F4.2 10+14Msun e_M500cSPT ? Error on M500cSPT
62 A1 --- Work [Y ] Source of spectroscopy in this work
64 I1 --- Lit [1/6]? Source of spectroscopy in
literature (4)
--------------------------------------------------------------------------------
Note (2): Flag as follows :
** = clusters are reported here as SPT detections for the first time;
* = clusters are new discoveries.
Note (3): Marginalized over cosmological parameters as in Reichardt et al.
(2013, J/ApJ/763/127), for those clusters at z >or= 0.3, except for two,
as described in Section 2.1.
Note (4): References as follows :
1 = Sifon et al. 2013, J/ApJ/772/25;
2 = Girardi et al. 1996ApJ...457...61G 1996ApJ...457...61G;
3 = Struble & Rood 1999ApJS..125...35S 1999ApJS..125...35S;
4 = Barrena et al. 2002A&A...386..816B 2002A&A...386..816B;
5 = Katgert et al. 1998, J/A+AS/129/399;
6 = Buckley-Geer et al. 2011, J/ApJ/742/48.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 A6 --- --- [SPT-CL]
8- 17 A10 --- SPT-CL SPT identifier of associated cluster (G1)
19- 37 A19 --- Galaxy Galaxy designation (2)
39- 48 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000)
50- 59 F10.6 deg DEdeg Declination in decimal degrees (J2000)
61- 66 F6.4 --- z Redshift
68- 73 F6.4 --- e_z Error in z
75- 82 A8 --- Method Redshift fitting method (3)
84 I1 --- Spectral [1/7] Main spectral features (4)
--------------------------------------------------------------------------------
Note (2): In the format Jhhmmss.ss+ddmmss.s (J2000; truncated coordinates).
Note (3): Method as follows:
rvsao-xc = RVSAO (routine "xcsao") cross-correlation with absorption spectrum;
rvsao-em = RVSAO (routine "emsao') fit to emission lines;
template = In-house chi2-minimization SDSS template fitting.
Note (4): Main spectral features as follows:
1 = Ca II H&K
2 = O II emission
4 = Other emission
3 = Ca II H&K and O II emission
5 = Ca II H&K and other emission
6 = O II emission and other emission
7 = O II emission, Ca II H&K and other emission
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 A6 --- --- [SPT-CL]
8- 17 A10 --- SPT-CL SPT identifier of associated cluster (G1)
19- 20 A2 --- n_SPT-CL [*abcde ] Note on SPT-CL (1)
22- 23 I2 --- N [3/78] Number of spectroscopic members as
determined by iterative 3σ clipping
25- 27 F3.1 --- ApRad ? Aperture radius within which members were
sampled in units of R200c,SPT
29- 34 F6.4 --- z Robust biweight average redshift
36- 41 F6.4 --- e_z Uncertainty in z
43- 46 I4 km/s sigmaSPT ? The "equivalent dispersion" calculated from
the SZ-based SPT mass σSPT
(see Section 3.2.1)
48- 51 I4 km/s sigmaG ? The measured gapper scale
53- 55 I3 km/s e_sigmaG ? Uncertainty in sigmaG
57- 60 I4 km/s sigmaBI ? Biweight dispersion
62- 64 I3 km/s e_sigmaBI ? Uncertainty in sigmaBI
--------------------------------------------------------------------------------
Note (1): Note as follows:
* = Indicates potentially less reliable dispersion measurements
(see Section 3.2);
a = For SPT-CL J0205-5829, see also Stalder et al. (2013ApJ...763...93S 2013ApJ...763...93S);
b = For SPT-CL J0546-5345, see also Brodwin et al. (2010ApJ...721...90B 2010ApJ...721...90B);
c = For SPT-CL J2040-4451, see also Bayliss et al. (2013, 1307.2903);
d = For SPT-CL J2106-5844, see also Foley et al. (2011ApJ...731...86F 2011ApJ...731...86F);
e = For SPT-CL J2344-4243, see also McDonald et al. (2012Natur.488..349M 2012Natur.488..349M).
--------------------------------------------------------------------------------
Global notes:
Note (G1): In the format SPT-CL Jhhmm+ddmm (J2000; truncated coordinates).
--------------------------------------------------------------------------------
History:
* 07-Apr-2017: From electronic version of the journal
* 19-Sep-2017: table4 added
* 17-Oct-2017: in table3, line 511, Galaxy name J043824.50-541715.7
corrected into J043824.41-541717.7
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 05-Apr-2017